Kamphaus Jason M, Rule Joseph D, Moore Jeffrey S, Sottos Nancy R, White Scott R
Department of Aerospace Engineering, University of Illinois, Urbana, IL 61801, USA.
J R Soc Interface. 2008 Jan 6;5(18):95-103. doi: 10.1098/rsif.2007.1071.
Using self-healing materials in commercial applications requires healing chemistry that is cost-effective, widely available and tolerant of moderate temperature excursions. We investigate the use of tungsten (VI) chloride as a catalyst precursor for the ring-opening metathesis polymerization of exo-dicyclopentadiene (exo-DCPD) in self-healing applications as a means to achieve these goals. The environmental stability of WCl6 using three different delivery methods was evaluated and the associated healing performance was assessed following fracture toughness recovery protocols. Both as-received and recrystallized forms of the WCl6 resulted in nearly complete fracture recovery in self-activated tests, where healing agent is manually injected into the crack plane, at 12wt% WCl6 loading. In situ healing using 15wt% microcapsules of the exo-DCPD produced healing efficiencies of approximately 20%.
在商业应用中使用自修复材料需要具备成本效益、易于获取且能耐受适度温度变化的修复化学方法。我们研究了将六氯化钨用作自修复应用中二环戊二烯（exo-DCPD）开环易位聚合的催化剂前体，以此作为实现这些目标的一种手段。使用三种不同递送方法评估了六氯化钨的环境稳定性，并按照断裂韧性恢复方案评估了相关的修复性能。在自激活测试（将修复剂手动注入裂纹平面）中，无论是原样接收的还是重结晶形式的六氯化钨，在六氯化钨负载量为12wt%时，都能使断裂几乎完全恢复。使用15wt%的二环戊二烯微胶囊进行原位修复，修复效率约为20%。
